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One copy machine can make 20 copies a minute , and a second copy machine makes 15 copies a minute. If the two copiers work together, how long would it take them to make 2100 copies?

A. 60 minutes
B. 105 minutes
C. 122 minutes
D. 140 minutes
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সঠিক উত্তরঃ A. 60 minutes
Explanation: